Ljunggren Audio Roll Your Own Penta

Transcription

1 Ljunggren Audio Roll Your Own Penta Version: Penta 1.0 Bills Of Material Bold = PCB1, The rest = PCB2 Type Parts Des cription Pow er header Qty Value 1 2x5pin POWER Euro pow er connector Jack 1 3.5mm J1, J2, J3 Potentiometer 5 100K lin POT1, POT2, POT3, POT4, POT5 PJ301M-12 / Thonkiconn / Inline Tall Trimmer 9mm Pots 20K to 100K linear, 100K f or rated current consumption. Socket strip 3 1x6pin PCB1-CON1, PCB1-CON2, PCB1-CON3 Pin strip 3 1x6pin PCB2-CON1, PCB2-CON2, PCB2-CON3 LED 3mm 5 orange L1, L2, L3, L4, L5 Toggle sw itch 1 on-off-on SW1 R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R17, R18 SPDT toggle sw itch on-off-on Resistor k Resistor 2 10R R1, R2 Ca 7mm resistor 1% Ca 7mm resistor 1/4W Resistor 1 2.2k Ca 7mm resistor f or LED Resistor 1 330R R19 R16 Diode 2 1N5818 D1, D2 Ca 7mm resistor Schottky rectifier. Pow er polarity protection. Alternatives: 1N5817, 1N5819, SB130. Capacitor 7 100nF C1, C2, C5, C7, C8, C9, C10 MLCC X7R Capacitor 1 15pF C11 Ceramic capacitor Electrolytic 2 10uF C3, C4 2mm pin pitch, 5mm dia, max 10mm height. Min 25V. Electrolytic 1 100uF C6 Transistor 7 2N7000 Q1, Q2, Q3, Q4, Q5, Q6, Q7 Volt regulator 1 LM2931 5V RG1 VOLTAGE REGULATOR IC socket 1 DIP14 CD4xxx 1 CD40106 IC1 DIP14 CMOS Hex Schmitt Trigger IC socket 1 DIP16 CD4xxx 1 CD4017 IC2 DIP16 CMOS Counter IC socket 1 DIP8 OpAmp 1 LM358 IC3 DIP8 Solder pad 7 LSP10 0V, HLD, ST1, ST2, ST3, ST4, ST5 Drill 1 mm, Pin pitch 2mm, For homebrew expanders. Pow er cable Mounting screw s 1 16pin-10pin Frontplate 1 4hp PCB1 1 PCB2 1 spacers 1 11mm nuts 1 for spacers screw s 1 for spacers 2 M3x6 black 2mm black PCB material

2 Assembly instructions We start with PCB2. Empty PCB2 top & bottom. Step 1 Solder resistors. Resistors are not sensitive to mounting direction. R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R17, R18 100K 12pcs R1, R2 10R 2pcs R16 330R 1pcs

3 Step 2 Solder power polarity protection diodes. Diodes are sensitive to mounting direction, make sure the stripe on the diode match the stripe on the silkscreen. D1, D2 1N5818 2pcs Step 3 Solder ceramic capacitors. Ceramic capacitors are not sensitive to mounting direction. C1, C2, C5, C7, C8, C9, C10 100nF 7pcs C11 15pF 1pcs Step 4 Solder IC sockets. Match the IC sockets indent (marking pin 1 side) with the silk screens. IC2 16 pin DIP socket. IC will be mounted later. IC3 8 pin DIP socket. IC will be mounted later.

4 IC1 14 pin DIP socket. IC will be mounted later. Step 5 Solder Volt regulator on the back side of PCB2. Match the regulators curved side with the curved side in the silkscreen. RG1 LM2931 5V 1pcs Step 6 Solder electrolytic capacitors on the front side of PCB2. Electrolytic capacitors are sensitive to mounting direction. Put the long pin in the hole marked with a + (anode) on the silkscreen. The opposite side is marked with (cathode) on the electrolytic capacitor. C3, C4 10µF 2pcs C6 100µF 1pcs

5 Step 7 Solder Transistors. Match the curved side of the transistor with the curved side in the silkscreen. Q1 2N7000 1pcs Step 8 Solder the power header to the back of PCB2. Make sure the key opening is oriented in the same way as in the picture below, at the same side as the -12V marking. It's easier to avoid bent pins if you attach the power cable in the header while you are soldering. POWER 2x5pin Step 9 Turn PCB2 back to the front side again and insert the ICs in the sockets. IC1 CD40106 IC2 CD4017 IC3 LM358

6 Step 10 Leave PCB2 on the side with the 3pcs of 6pin pin-strips not soldered. Now it's time for PCB1. Empty PCB1 top & bottom. Step 11 Solder resistors. Resistors are not sensitive to mounting direction. The resistors of PCB1 need to be bent like in the picture below to fit in vertical. R19 2.2K 1pcs LED resistor

7 R3, R4, R5 100K 3pcs Step 12 Solder Transistors. Match the curved side of the transistor with the curved side in the silkscreen. Q2, Q3, Q4, Q5, Q6, Q7 2N7000 6pcs Step 13 Place the potentiometers, jacks, switch and LEDs in their positions but don't solder them yet. The long pin of the LEDs goes into the hole with a square pad. Place the front panel on top and add 1 washer and 1 nut to each jack and the switch. Use a socket wrench to avoid scratching of the frontplate. Keep the nuts for the jacks and the nuts on the switch separated as they look similar. The nut from the switch can fit on the jacks but the jacks nuts won't fit on the switch. Turn it upside down and make sure the LEDs go into their respective panel hole properly. Now you solder all panel components in place.

8 Step 14 Mount the spacer with the nut on PCB1. Step 15 Attach the 3pcs of 6pin socket strips and 3pcs of 6pin pin-strips together to prepare them for soldering.

9 Step 16 After putting the pin & socket strips into each other. Place them between PCB1 and PCB2 at the positions in the picture below. Take a firm grip with a plier around the spacers and screw the screws into place like in the picture below.

10 Step 17 Solder the connectors between PCB1 & 2 in place. Step 18 Attach the power cable. The stripe indicating pin 1 should be at the -12V side.

11 Finished module!

12 Bonus pads You can use these pads to further expand the usability of the Penta with your own homebrewed expander. The pads ST1, ST2, ST3, ST4, ST5 are directly connected to each steps output pin of IC2 CD4017. They will output 5V while a step is active and 0V the rest of the time. The simplest way to get gate outputs is to connect them to jacks through 1k resistors. The HLD pad is connected to the enable pin of IC2 CD4017 through the spare schmitt inverters of IC1 CD It will give conditioned schmitt trigger input for the HLD function with a decent hysteresis for noise resitance. The HLD function when fed with a 5V gate it will hold the active step in the sequence until HLD returns to 0V. The simplest way to get the hold input is to connect a jack to the pad through a 10k resistor. The 0V pad will provide 0V/GND to the jacks sleeves/your expansion. If you wish to make more elaborate expansions or add extra safety or buffers on inputs and outputs Penta 1.0 Schematics can be found here.